fix #2365 add job name

...ain/java/org/codelibs/fess/app/job/ScriptExecutorJob.java

src/main/java/org/codelibs/fess/exec/Crawler.java

src/main/java/org/codelibs/fess/helper/JobHelper.java

src/main/java/org/codelibs/fess/job/CrawlJob.java

src/main/java/org/codelibs/fess/job/ExecJob.java

...main/java/org/codelibs/fess/job/GenerateThumbnailJob.java

src/main/java/org/codelibs/fess/job/SuggestJob.java

.../java/org/codelibs/fess/mylasta/mail/CrawlerPostcard.java

src/main/resources/mail/crawler.dfmail